Journal
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
Volume -, Issue 10, Pages -Publisher
IOP Publishing Ltd
DOI: 10.1088/1475-7516/2019/10/032
Keywords
baryon asymmetry; primordial magnetic fields; inflation
Funding
- Deutsche Forschungsgemeinschaft under Germany's Excellence Strategy [EXC 2121, 390833306]
- Mainz Institute for Theoretical Physics (MITP) of the DFG Cluster of Excellence PRISMA+ [39083149]
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The coupling of an axion-like particle driving inflation to the Standard Model particle content through a Chern-Simons term generically sources a dual production of mass-less helical gauge fields and chiral fermions. We demonstrate that the interplay of these two components results in a highly predictive baryogenesis model, which requires no further ingredients beyond the Standard Model. If the helicity stored in the hyper magnetic field and the effective chemical potential induced by the chiral fermion production are large enough to avoid magnetic diffusion from the thermal plasma but small enough to sufficiently delay the chiral plasma instability, then the non-vanishing helicity survives until the electroweak phase transition and sources a net baryon asymmetry which is in excellent agreement with the observed value. If any of these two conditions is violated, the final baryon asymmetry vanishes. The observed baryon asymmetry can be reproduced if the energy scale of inflation is around H-inf similar to 10(10) -10(12) GeV with a moderate dependence on inflation model parameters.
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